Fuel and oil system

Abstract

A fuel and oil system includes a fuel pump, an oil pump, and a fixed electrical drive. A first electric motor controller of the fuel and oil system supplies a variable electrical drive, and a second electric motor controller supplies a variable electrical drive. The fuel pump is selectively connected to and driven by the first electric motor controller or the second electric motor controller. The oil pump is selectively connected to and driven by the second electric motor controller or the fixed electrical drive.

The invention claimed is: 
     
       1. A fuel and oil system comprising: a fuel pump; an oil pump; a first electric motor controller configured to supply a variable electrical drive; a second electric motor controller configured to supply a variable electrical drive, the first electric motor controller and the second electric motor controller being both selectively connected to the fuel pump; and a fixed electrical drive, the fixed electrical drive and the second electric motor controller being both selectively connected to the oil pump, the fixed electrical drive functioning as a backup upon a failure of one of the first electric motor controller or the second electric motor controller, the first electric motor controller and the second electric motor controller respectively, operating in conjunction with a motor of the fuel pump, detecting the failure by receiving no power supply or a reduced amount of power supply as compared to normal operation, wherein: in a first configuration, the fuel pump is connected to and driven by the first electric motor controller and the oil pump is connected to and driven by the second electric motor controller, in response to detecting the failure of the first electric motor controller by the first electric motor controller, the fuel and oil system switches into a second configuration by controlling a plurality of switches, in the second configuration the fuel pump is connected to and driven by the second electric motor controller and the oil pump is connected to and driven by the fixed electrical drive, and in response to detecting the failure of the second electric motor controller by the second electric motor controller, the fuel and oil system switches into a third configuration by controlling the plurality of switches, in the third configuration the fuel pump is connected to and driven by the first electric motor controller and the oil pump is connected to and driven by the fixed electrical drive. 
     
     
       2. The fuel and oil system as claimed in  claim 1 , further comprising a spill valve connected to an output of the oil pump. 
     
     
       3. The fuel and oil system as claimed in  claim 1 , wherein the first electric motor controller and the second electric motor controller are each a different type of electric motor controller. 
     
     
       4. The fuel and oil system as claimed in  claim 2 , wherein the first electric motor controller and the second electric motor controller are each a different type of electric motor controller. 
     
     
       5. The fuel and oil system as claimed in  claim 1 , further comprising a cooling arrangement. 
     
     
       6. The fuel and oil system as claimed in  claim 5 , wherein the cooling arrangement includes a first cooling loop arranged to cool the first electric motor controller and a second cooling loop arranged to cool the second electric motor controller. 
     
     
       7. The fuel and oil system as claimed in  claim 5 , wherein the cooling arrangement includes a common cooling loop arranged to cool both the first electric motor controller and the second electric motor controller. 
     
     
       8. A gas turbine engine comprising the fuel and oil system as claimed in  claim 1 . 
     
     
       9. A diesel engine comprising the fuel and oil system as claimed in  claim 1 .